package com.onstar.cn.payme.payutil.wxpay;

import java.security.MessageDigest;

/**
 * 
* @ClassName: PayMD5 
* @Description: 支付MD5加密公用类
* @author Xiaofeng Feng
* @date 2015年9月9日 下午1:44:53
 */
public class PayMD5 {
	private PayMD5() {}
	public final static String getMessageDigest(byte[] buffer) {
		char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
		try {
			MessageDigest mdTemp = MessageDigest.getInstance("MD5");
			mdTemp.update(buffer);
			byte[] md = mdTemp.digest();
			int j = md.length;
			char str[] = new char[j * 2];
			int k = 0;
			for (int i = 0; i < j; i++) {
				byte byte0 = md[i];
				str[k++] = hexDigits[byte0 >>> 4 & 0xf];
				str[k++] = hexDigits[byte0 & 0xf];
			}
			return new String(str);
		} catch (Exception e) {
			return null;
		}
	}
}
